Catalytic combustion process using a plurality of successive cat

Details Catalytic combustion process using a plurality of successive cat Catalytic combustion process using a plurality of successive cat

1996-12-20

1999-05-04

Straub, Gary P.

Combustion

Process of combustion or burner operation

In a porous body or bed, e.g., surface combustion, etc.

423210, 4232453, 502302, 502304, 502324, 502325, 502326, 502340, 502341, F23M 1300, B01J 1900

Patent

active

058996796

ABSTRACT:
A catalytic combustion process for at least one fuel comprises the use of a plurality of successive catalytic zones, the process being characterized in that at least one of the first catalytic zones includes a catalyst comprising a monolithic substrate, a porous support based on a refractory inorganic oxide and an active phase constituted by cerium, iron and optionally zirconium, also at least one metal selected from the group formed by palladium and platinum; and in that at least one of the subsequent catalytic zones includes an active phase comprising: an oxide of at least one element A with valency X selected from the group formed by barium, strontium and rare-earths; at least one element B with valency Y selected from the group formed by Mn, Co and Fe; and at least one element C selected from the group formed by Mg and Zn, and aluminium; the oxide may have formula A.sub.1-x B.sub.y C.sub.z Al.sub.12-y-z O.sub.19-.delta., x being 0 to 0.25, y being 0.5 to 3; and z being 0.01 to 3; the sum y+z having a maximum value of 4 and .delta. having a value which is a function of the respective valencies X and Y of elements A and B and the values of x, y and z, and is equal to 1-1/2{(1-x)X+yY-3y-z}.

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